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Abstract

We have fabricated photorefractive InGaAs/GaAs multiple quantum wells operating
at a wavelength of 1064 nm and have characterized its photorefractive properties in the
Franz-Keldysh geometry. A maximum gain coefficient of 200 cm<sup>-1</sup> and a maximum
four-wave mixing diffraction efficiency of 0.07% are obtained at an applied field of 15
kV/cm. Adaptive vibration measurement in a two- wave mixing configuration has also been
demonstrated. The noise equivalent surface displacement of our measurement system is
estimated at about 1.5xl0<sup>-6</sup> nm(W/Hz)<sup>1/2</sup>.